Feature Request: Pre/Post snapshot script

[dfein38347g]

It would be great to be able to run a script right before the snapshot and right after. Like I could bring down my docker containers with databases in them, take the snapshot, then bring them back online for data integrity

[jortan]

I've added this to fork here: https://github.com/jortan/borgsnap

Not tested extensively, please open an issue there if anything doesn't work