**expected size**: around 30GB per `march` (e.g. *x86-64-v3*) you want to sync.
I highly recommend using [this script from Archlinux](https://gitlab.archlinux.org/archlinux/infrastructure/-/blob/master/roles/syncrepo/files/syncrepo-template.sh) as base for a sync service. It checks if a sync needs to be done (by comparing *lastupdate* before syncing). It's also worth to read comments.
You are free to mirror only some march or exclude `/logs`, [see line 90](https://gitlab.archlinux.org/archlinux/infrastructure/-/blob/a4a8a640d821acdb95e72770ea0632beffb28df9/roles/syncrepo/files/syncrepo-template.sh#L90) of said script above.
If you have set up a new mirror, open a PR here in this repo adding your mirror to `mirrorlist` under the appropriate region (continent is detailed enough for our current mirror density).