Comment by darkpuma

If this is yours, I recommend adopting some sort of inverse relationship between file size and retention time. 0x0 does this and I think it makes a lot of sense: https://0x0.st/

    retention = min_age + (-max_age + min_age) * pow((file_size / max_size - 1), 3)

   days
    365 |  \
        |   \
        |    \
        |     \
        |      \
        |       \
        |        ..
        |          \
  197.5 | ----------..-------------------------------------------
        |             ..
        |               \
        |                ..
        |                  ...
        |                     ..
        |                       ...
        |                          ....
        |                              ......
     30 |                                    ....................
          0                        256                        512
                                                              MiB