After a fresh install of EOS with Plasma, I installed Backintime from the AUR. When starting, the icon appears briefly and disappears. Back intime is not active according to the system monitor.
For the new installation I took over data from the backup. Attempting to delete the Backintime folders from ./config and ./local was unsuccessful.
which: no crontab in (/usr/local/sbin:/usr/local/bin:/usr/bin:/var/lib/flatpak/exports/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)
which: no fcrontab in (/usr/local/sbin:/usr/local/bin:/usr/bin:/var/lib/flatpak/exports/bin:/usr/bin/site_perl:/usr/bin/vendor_perl:/usr/bin/core_perl)
CRITICAL: Command crontab and fcrontab not found.
Traceback (most recent call last):
File "/usr/share/backintime/common/backintime.py", line 24, in <module>
import config
File "/usr/share/backintime/common/config.py", line 48, in <module>
import schedule
File "/usr/share/backintime/common/schedule.py", line 54, in <module>
CRONTAB_COMMAND = _determine_crontab_command()
File "/usr/share/backintime/common/schedule.py", line 51, in _determine_crontab_command
raise RuntimeError(msg)
RuntimeError: Command crontab and fcrontab not found.