Updated Problems (markdown)

Problems.md

@@ -32,6 +32,16 @@ Try using the --ignore-transfer-errors option. This will ignore the error. It wi
 
 This happens if you forget to use --encrypt, while the target datasets are already encrypted. (Very strange error message indeed)
 
+## "dataset is busy"
+
+If you try to destroy a snapshot and it busy, there might be multiple reasons, but dont forget to check if the snapshot has holds with:
+
+> zfs holds `zpool/fs1@snapshot1`
+
+Release it with zfs release.
+
+Use --no-holds in zfs-autobackup if you dont want to use holds.
+
 ## Other problems
 
 Feel free to ask questions about zfs-autobackup on our issue tracker at https://github.com/psy0rz/zfs_autobackup/issues