Comment 5 for bug 1658309

I had the same problem but was running hourly, daily, weekly and monthly (on Linux Mint 18.1), backing up to an external drive. Didn't discover it had stopped on the 14th until yesterday. Things _didn't_ resume after updating to 17.2.

I then deleted all snapshots and made a manual backup. Since then a monthly backup has been made but not yet any daily, weekly or hourly backups.