I used to be so worried about equipment failure I actually kept 2 canisters in my community tank. One did eventually fail (well it was 15 years old) and I replaced it with a super cheap sponge filter which works off an air pump. I don't need the extra filtration but it means I always have a cycled filter ready to go if I need a quarantine / hospital / breeding tank in a hurry.
I also have enough plants in there that I am confident the tank will survive a few days without a filter - although the sponge filter means I should never have to put it to the test.
I also have enough plants in there that I am confident the tank will survive a few days without a filter - although the sponge filter means I should never have to put it to the test.