I don't see an issue template anywhere so, the exception is below, and I'll attach the crash report.

[17:00:00] [ftbbackups2_Worker-1/INFO]: Attempting to create an automatic backup
[17:00:00] [ftbbackups2_Worker-1/INFO]: Found world folder at C:\Users\madca\Desktop\TestEnvironment\SMPBEtterMC.\world.
[17:00:00] [ftbbackups2_Worker-1/INFO]: Last backup size: 56.4MB Current world size: 82.5MB Current free space: 243.6GB ExpectedSize 64.1MB
[17:00:00] [ftbbackups2_Worker-1/ERROR]: Job DEFAULT.ftbbackups2 threw an unhandled Exception:
java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 33
at it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet.removeFirstLong(LongLinkedOpenHashSet.java:601) ~[fastutil-8.5.6.jar:?]
at net.minecraft.class_3554.method_15492(class_3554.java:207) ~[server-intermediary.jar:?]
at net.minecraft.class_3204$class_3205.method_14057(class_3204.java:378) ~[server-intermediary.jar:?]
at net.minecraft.class_3204$class_3948.method_14057(class_3204.java:444) ~[server-intermediary.jar:?]
at net.minecraft.class_3204.method_15892(class_3204.java:124) ~[server-intermediary.jar:?]
at net.minecraft.class_3215.method_16155(class_3215.java:283) ~[server-intermediary.jar:?]
at net.minecraft.class_3215$class_4212.method_16075(class_3215.java:562) ~[server-intermediary.jar:?]
at net.minecraft.class_1255.method_18857(class_1255.java:140) ~[server-intermediary.jar:?]
at net.minecraft.class_3898.method_20584(class_3898.java:464) ~[server-intermediary.jar:?]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?]
at net.minecraft.class_3898.method_17242(class_3898.java:470) ~[server-intermediary.jar:?]
at net.minecraft.class_3215.method_17298(class_3215.java:306) ~[server-intermediary.jar:?]
at net.minecraft.class_3218.method_14176(class_3218.java:762) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_3723(MinecraftServer.java:526) ~[server-intermediary.jar:?]
at net.creeperhost.ftbbackups.BackupHandler.createBackup(BackupHandler.java:197) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.BackupHandler.createBackup(BackupHandler.java:171) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.FTBBackups$BackupJob.execute(FTBBackups.java:132) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.org.quartz.core.JobRunShell.run(JobRunShell.java:206) [ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:548) [ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
[17:00:00] [ftbbackups2_Worker-1/ERROR]: Job (DEFAULT.ftbbackups2 threw an exception.
net.creeperhost.ftbbackups.org.quartz.SchedulerException: Job threw an unhandled exception.
at net.creeperhost.ftbbackups.org.quartz.core.JobRunShell.run(JobRunShell.java:217) [ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:548) [ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
Caused by: java.lang.ArrayIndexOutOfBoundsException: Index -1 out of bounds for length 33
at it.unimi.dsi.fastutil.longs.LongLinkedOpenHashSet.removeFirstLong(LongLinkedOpenHashSet.java:601) ~[fastutil-8.5.6.jar:?]
at net.minecraft.class_3554.method_15492(class_3554.java:207) ~[server-intermediary.jar:?]
at net.minecraft.class_3204$class_3205.method_14057(class_3204.java:378) ~[server-intermediary.jar:?]
at net.minecraft.class_3204$class_3948.method_14057(class_3204.java:444) ~[server-intermediary.jar:?]
at net.minecraft.class_3204.method_15892(class_3204.java:124) ~[server-intermediary.jar:?]
at net.minecraft.class_3215.method_16155(class_3215.java:283) ~[server-intermediary.jar:?]
at net.minecraft.class_3215$class_4212.method_16075(class_3215.java:562) ~[server-intermediary.jar:?]
at net.minecraft.class_1255.method_18857(class_1255.java:140) ~[server-intermediary.jar:?]
at net.minecraft.class_3898.method_20584(class_3898.java:464) ~[server-intermediary.jar:?]
at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197) ~[?:?]
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625) ~[?:?]
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509) ~[?:?]
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[?:?]
at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[?:?]
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[?:?]
at java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596) ~[?:?]
at net.minecraft.class_3898.method_17242(class_3898.java:470) ~[server-intermediary.jar:?]
at net.minecraft.class_3215.method_17298(class_3215.java:306) ~[server-intermediary.jar:?]
at net.minecraft.class_3218.method_14176(class_3218.java:762) ~[server-intermediary.jar:?]
at net.minecraft.server.MinecraftServer.method_3723(MinecraftServer.java:526) ~[server-intermediary.jar:?]
at net.creeperhost.ftbbackups.BackupHandler.createBackup(BackupHandler.java:197) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.BackupHandler.createBackup(BackupHandler.java:171) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.FTBBackups$BackupJob.execute(FTBBackups.java:132) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
at net.creeperhost.ftbbackups.org.quartz.core.JobRunShell.run(JobRunShell.java:206) ~[ftbbackups2-fabric-1.19.2-1.0.16.jar:?]
... 1 more
crash-2022-11-22_17.02.41-server.txt

Should be fixed in 1.0.17