Since my original thread has been closed and this seems to be the replacement thread, here goes…
I don’t think this is directly related to a summer/winter time change.
A summer (GMT-4) job scheduled at 7:15pm (M-F) will run on a Sunday at 8:15pm because Duplicati thinks it’s 0:15am on Monday (see screenshot Dup-Rep-DST.jpg).
A winter (GMT-5) job scheduled at 7:15pm (M-F) will run on a Sunday at 7:15pm because Duplicati thinks it’s 0:15am on Monday (Dup-Rep-EST.jpg).
A summer (GMT-4) job scheduled at 7:15pm (M-F) won’t run on a Friday because Duplicati thinks it’s 0:15am on Saturday.
A winter (GMT-5) job scheduled at 7:15pm (M-F) won’t run on a Friday because Duplicati thinks it’s 0:15am on Saturday.
In either case, whether it’s winter or summer, the start time for this job is 0:15am GMT… It’s getting hard to wrap my head around the logic here!
Btw, this has been an issue since at least the 1st few months of 2017.