Previously
Before
noun
From before, just means previously or before now.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
以前の生活
life as it had been before
以前の自分
my former self
以前のバージョン
previous version
以前からしている
to have been doing from before
以前からある
to have been present from before
以前から知っている
to have known from before
以前にいた
was there previously
以前にした
did previously
以前にあった
was previously there
あの男の人は、以前会ったことがある人です。
That man is someone I've met before.
以前は、シドニーによく来ていました。
Before, I used to come to Sydney often.
２０２０年以前、オリンピック大会がリスケジュールされたことはありませんでした。
Before 2020, the Olympic Games had never been rescheduled.