Mirrors:
http://time-based.snapshots.deb.tails.boum.org/debian/2021101401
http://time-based.snapshots.deb.tails.boum.org/debian-security/2022012201
http://time-based.snapshots.deb.tails.boum.org/torproject/2021110301
Additional sources:
deb http://time-based.snapshots.deb.tails.boum.org/debian/2021101401 bullseye main contrib non-free
deb http://time-based.snapshots.deb.tails.boum.org/debian-security/2022012201 bullseye-security main contrib non-free
deb http://time-based.snapshots.deb.tails.boum.org/debian/2021101401 buster-backports main contrib non-free
deb http://time-based.snapshots.deb.tails.boum.org/debian/2021101401 sid main contrib non-free
deb http://deb.tails.boum.org/ stable main contrib non-free
deb http://time-based.snapshots.deb.tails.boum.org/torproject/2021110301 buster main